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import metrics from '../metrics'; |
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const metricsSpecs = [ |
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{ |
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name: 'serverRestart', |
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type: 'counter', |
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help: `the number of times server(node instance) restarted, an unexpected high number indicates crash loop`, |
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}, |
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{ |
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name: 'dbConnect_timer', |
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type: 'summary', |
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help: `the time to create db connection to monitor upstream service health`, |
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labelNames: ['envId'], |
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}, |
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{ |
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name: 'dbConnect_error', |
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type: 'counter', |
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help: `the number of db connection errors`, |
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labelNames: ['envId'], |
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}, |
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{ |
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name: 'orderValue', |
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type: 'histogram', |
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help: 'price summary of shopping orders', |
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buckets: [10, 100, 1000, 10000, 100000], |
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labelNames: ['envId', 'length'], |
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}, |
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]; |
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describe('metrics', () => { |
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beforeEach(() => { |
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metrics.load(metricsSpecs); |
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}); |
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afterEach(() => { |
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metrics.reset(); |
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}); |
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it('is an object with the following methods', () => { |
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expect(typeof metrics).toBe('object'); |
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expect(metrics).toHaveProperty('load'); |
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expect(metrics).toHaveProperty('add'); |
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expect(metrics).toHaveProperty('find'); |
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}); |
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it('.load() can create a list of metrics unit', () => { |
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metrics.reset(); |
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metrics.load(metricsSpecs); |
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const units = metrics.list(); |
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expect(Object.keys(units)).toHaveLength(4); |
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}); |
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it('.load() throws an error if invalid metrics type was specified', () => { |
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metrics.reset(); |
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const invalidSpecs = [ |
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{ |
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name: 'someName', |
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type: 'randomType', |
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}, |
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]; |
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try { |
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metrics.load(invalidSpecs); |
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} catch (e) { |
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expect(e).toBeDefined(); |
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} |
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}); |
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it('.find() can find a metrics unit', () => { |
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const dbConnectTimer = metrics.find({ action: 'dbConnect', type: 'timer' }); |
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expect(dbConnectTimer).toBeDefined(); |
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}); |
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it('.find() throws an error if no unit found', () => { |
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try { |
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metrics.find({ action: 'dbConnect', type: 'invalid' }); |
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} catch (e) { |
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expect(e).toBeDefined(); |
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} |
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}); |
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81
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it('counter.count() with excessive labels', () => { |
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const counter = metrics.find({ name: 'dbConnect_error' }); |
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counter.count({ envId: 'test', foo: 'bar' }); |
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counter.count({ envId: 'test', foo: 'bar' }, 2); |
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expect(counter.value()).toBe(3); |
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}); |
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it('counter.value() to get the current total count with optional filter', () => { |
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const counter = metrics.find({ name: 'dbConnect_error' }); |
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expect(counter.value()).toBe(0); |
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counter.count(); |
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expect(counter.value()).toBe(1); |
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counter.count({ envId: 'test' }); |
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counter.count({ envId: 'prod' }); |
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expect(counter.value({ envId: 'test' })).toBe(1); |
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expect(counter.value({ envId: 'prod' })).toBe(1); |
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}); |
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98
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99
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it('counter.stats() to get distribution of all values of a label', () => { |
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const counter = metrics.find({ name: 'dbConnect_error' }); |
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expect(counter.value()).toBe(0); |
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counter.count(); |
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counter.count({ envId: 'test' }); |
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counter.count({ envId: 'test' }); |
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counter.count({ envId: 'prod' }); |
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expect(counter.stats('envId')).toMatchSnapshot(); |
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}); |
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}); |
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opbi /
toolchain
